Electronic overload relay having intrinsic power supply operable

Details Electronic overload relay having intrinsic power supply operable Electronic overload relay having intrinsic power supply operable

1995-12-05

1998-02-03

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

307125, H02H 300

Patent

active

057151296

ABSTRACT:
An electronic overload relay has an intrinsic power supply connected in parallel with the NC contact of the relay between wire attachment terminals. The power supply is a parallel connected zener diode and capacitor, connected to the processor in parallel with a low voltage sensing circuit that detects the charge on the capacitor, whereby the processor operates to turn on a unijunction transistor for low voltage coil applications to shunt the power supply during contactor closing and turn off a predetermined interval later by which time the contactor should have closed.

REFERENCES:
patent: 3965396 (1976-06-01), Tyler et al.
patent: 4297741 (1981-10-01), Howell
patent: 5038246 (1991-08-01), Durivage, III
patent: 5243489 (1993-09-01), Dougherty
patent: 5283708 (1994-02-01), Waltz
patent: 5373412 (1994-12-01), Dousse
patent: 5570262 (1996-10-01), Doerwald
patent: 5604387 (1997-02-01), Cheyne

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